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<h2>Progression of Record times for track races, 1912 - 2008</h2>

<h3>Description</h3>

<p>Progression in world record times for track and road races.</p>


<h3>Usage</h3>

<pre>data(progression)</pre>


<h3>Format</h3>

<p>A data frame with 227 observations on the following 4 columns.
</p>

<dl>
<dt><code>year</code></dt><dd><p>Year that time was first recorded</p>
</dd>
<dt><code>Distance</code></dt><dd><p>distance in kilometers</p>
</dd>
<dt><code>Time</code></dt><dd><p>time in minutes</p>
</dd>
<dt><code>race</code></dt><dd><p>character; descriptor for event (100m, mile, ...)</p>
</dd>
</dl>



<h3>Details</h3>

<p>Record times for men's track events, from 1912 onwards.  The
series starts with times that were recognized as record times in 1912,
where available.
</p>


<h3>Source</h3>

<p>Links to sources for the data are at
</p>
<p><a href="http://en.wikipedia.org/wiki/Athletics_world_record">http://en.wikipedia.org/wiki/Athletics_world_record</a>
</p>


<h3>Examples</h3>

<pre>
data(progression)
plot(log(Time) ~ log(Distance), data=progression)
xyplot(log(Time) ~ log(Distance), data=progression, type=c("p","r"))
xyplot(log(Time) ~ log(Distance), data=progression,
       type=c("p","smooth"))
res &lt;- resid(lm(log(Time) ~ log(Distance), data=progression))
plot(res ~ log(Distance), data=progression,
     ylab="Residuals from regression line on log scales")
</pre>


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